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BARC ME 2019: Mini Mock-1

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Question 1

From the lists given below, choose the most appropriate set of heat treatment process and the corresponding process characteristics ______.

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Question 2

Evaluate

where

bounding the region x²+y²= 9, z= 0 & z=2

Question 3

Two masses connected to a steel wire was passed over a pulley. The masses are 42 N and 24 N. If the mass m₁ tends to accelerate upwards. Determine the rate of change in velocity of mass m₂.

Question 4

A gate of 3.6 m radius and 5 m length is mounted on the spillway of a dam as shown in figure. The magnitude of pressure thrust exerted by water on the gate by neglecting the frictional effects will be (given circular arc angle θ=60°)

Question 5

A Jet of water of diameter 60 mm moving with a velocity of 50 m/s, strikes a curved fixed symmetrical plate at the centre. The force exerted by the Jet of water in the direction of Jet, if Jet is deflected through an angle of 120 ° at outlet of curved plate is ___.

Question 6

A balanced counter flow heat exchanger has inlet and outlet temperatures of the fluid receiving the heat as 20℃and 40℃. The LMTD of the heat exchanger is 35℃. If the exit temperature of the fluid which transfers the heat to the other fluid is 55℃, determine the inlet temperature of the fluid.

Question 7

The kinematic viscosity of a fluid flowing past a flat plate is 10^-3m²/s. If the Prandtl number is 0.71, then the value of the thermal conductivity of the fluid.The fluid properties at 25°C is C_p= 1.2 kJ/kgK, ρ= 1.25kg/m³

Question 8

For an exponential smoothing method of forecasting, the value of number of demand is 12, Find the exponential smoothing coefficient α for such a forecasting model.

Question 9

In a concentric spring of same length the ratio of the outer spring diameter to the inner spring diameter is 2 and assume the same spring index, the ratio of the outer spring force to the inner spring force is

Question 10

In order to clamp the tool and restrict all degree of freedom the 3,2,1 pin method is generally used for such application. How many pins are used for such constructions.

Question 11

A spherical drop of molten metal of radius 2 mm was found to solidify in 10 s. A similar drop of radius 8 mm would solidify in

Question 12

A 20 mm diameter, 4 m long rod provided with a rigid collar at its lower end hangs from a ceiling. This rod is stretched by a load dropping freely by gravity on the collar. The maximum load (in kN) that can be dropped from a height of 150 mm so that the elastic limit stress of 350 MPa does not exceed is (take E = 210 GPa)

Question 13

A bar 12mm diameter gets stretched by 3mm under a steady load of 8000N. What stress would be produced in the same bar by a weight of 800N, which falls vertically through a distance of 8cm on to a rigid collar attached at its end? The bar is initially unstressed. Take, E=2×10⁵ N/ mm².

Question 14

For a constrained kinematic chain having 6 link and no higher pair, the relative motion among the links is also assumed to have a Degree of Freedom as 1. Find the number of binary joints.

Question 15

A flywheel of moment of inertia 9.8 kg m² fluctuates by 30 rpm, if the fluctuation in the speed is not to exceed ±3%, Then the mean angular speed of the flywheel is. Take ∆E = 3 kJ

Question 16

A 4-stroke and 6 cylinder gas engine with a stroke volume of 2 litre develops 30 KW at 510 rpm. The indicated mean effective pressure is 600 KN/m². The average no. of times each cylinder misfired in one minute is

Question 17

Steam enters an adiabatic turbine operating at steady state with an enthalpy of 3251.0 kJ/kg and leaves as a saturated mixture at 15 kPa with quality (dryness fraction) 0.9 The enthalpies of the saturated liquid and vapor at 15 kPa are h_f = 225.94 kJ/kg and h_g = 2598.3 kJ/kg respectively. The mass flow rate of steam is 10 kg/s. Kinetic and potential energy changes are negligible. The power output of the turbine in MW is

Question 18

A refrigerator is running with COP 1.47 and the refrigeration effect is 8000 KJ/day. Assume the refrigerator is under ideal condition and no heat mechanical efficiency of the engine 100%. Find the compressor work input (in KW-hr/day).

Question 19

A heat engine receives heat from a source at 1500 K at a rate of 450 kW and rejects the waste heat to a medium at 300 K. The power output of the heat engine is 180 kW. Determine the irreversibility rate for this process _________.

Question 20

A spherical shaped orange (k= 0.3W/m℃) 80mm in diameter undergoes ripening process and generates 5000W/m³ of energy. If external temperature of orange is 10℃ and it is surrounded by air having heat transfer coefficient 20W/m²-k then the maximum temperature (℃) in at the centre of orange will be

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